ICSE Class 10 Physics 2019 Solved Paper

Two waves of the same pitch have amplitudes in the ratio $1: 3$ . What will be the ratio of their:

Question : 19 of 74

Marks: +1, -0

intensities and

Solution:

Since,

I ∝ a^2

∴ \;\;{I_1}/{I_2}= (\;{a_1}/{a_2}) ^2

⇒ \;{I_1}/{I_2}= (\;{1}/{3}) ^2=\;{1}/{9}

⇒ {\I}_1: {\I}_2=1: 9

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